Cards (17)

  • What does the term "mole" refer to in chemistry?

    A unit used to measure the amount of chemical substance
  • How is the mole similar to other units of measurement like meters and seconds?
    It measures the amount of substance, just as meters measure distance and seconds measure time
  • How many particles are contained in one mole of a substance?
    1. 02 times 10 to the 23 particles
  • What types of particles can be referred to as "particles" in the context of moles?
    Atoms, molecules, ions, or electrons
  • If you have one mole of carbon, how many atoms of carbon do you have?
    1. 02 times 10 to the 23 atoms of carbon
  • What is Avogadro's constant?
    It is the number of particles in one mole, which is 6.02 times 10 to the 23
  • Why is Avogadro's constant significant in chemistry?
    Because the mass of that many particles of any substance equals its relative atomic or formula mass in grams
  • What is the weight of one mole of carbon dioxide (CO2) with a relative formula mass of 44?
    44 grams
  • How can you calculate the number of moles in a sample?
    By dividing the mass of the element or compound by its relative formula mass (mr)
  • If you have 42.5 grams of ammonia (NH3), how many moles do you have?
    1. 5 moles
  • How do you find the mass of 3 moles of carbon dioxide (CO2)?
    Multiply 3 moles by the relative formula mass of CO2, which is 44 grams
  • What is the mass of carbon in 3 moles of carbon dioxide (CO2)?
    36 grams
  • How can you find the mass of oxygen in 3 moles of carbon dioxide (CO2)?
    By subtracting the mass of carbon from the total mass of CO2
  • What does a chemical equation represent in terms of moles?
    It represents the ratios of moles of reactants and products
  • In the reaction of magnesium with hydrochloric acid, how many moles of hydrochloric acid are needed for 2 moles of magnesium?
    4 moles of hydrochloric acid
  • How many moles of magnesium chloride are produced from 2 moles of magnesium reacting with hydrochloric acid?
    2 moles of magnesium chloride
  • How many moles of hydrogen gas are produced from 2 moles of magnesium reacting with hydrochloric acid?
    2 moles of hydrogen gas